Packaging



April 1941- F. D. PALMER 2,239,398

PACKAGING Filed March 18. 1939 3 Sheets-Sheet l W W wz April 22, 1941. F. D. PALMER 2,239,398

PACKAGING I Filed March 18. 1939 :s sheets-smut 2 April 22,1941. F. D. PALMER PACKAGING Filed March 18. 1939 3 Sheets-Sheet 5 MEN/25 0w:

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I Patented Apr. 22, 1941 PACKAGING Frank D. Palmer, Chicago, m, semi to Kim Cheese Company, a corporation of Delaware Application March 18, 1939, Serial No. 262,606

' (c1. z2a-14) 8 Claims. This invention relates to packaging and more particularly to packaging for products such as food and other materials which it is desired to enclose in substantially impermeable wrappings so as to effectively preserve the same against either I or both the absorption and loss of moisture.

The main objects of the present invention are to provide an impermeable package of simple 7 construction but which will nevertheless be highly efficient in respect of its ability to preserve the material contained therein; to provide such a package which may be made on automatic machinery; to provide an improved package of the indicated character which may be made mainly on existing package-forming machinery with which many manufacturers of food and other products are already equipped; to provide an efllcient impermeable package which will be heat in appearance so as to add sales appeal to food and other products contained in the package and which will be relatively inexpensive to produce, notwithstanding its-exceptionally high efliciency for-the purpose indicated.

Other objects and advantages of the invention will be understood by reference to the following specification and accompanying drawings (three sheets) wherein the improved package and the steps in forming the same are illustrated.

In thedrawings:

Figure 1 is a perspective showing two blanks, on of which forms a relatively strong, protective outer container, and the other of which forms an impervious wrapper or liner; 7

Figures 2, 3 and 4 are perspectives illustrating successive steps in the formation of the package;

Figures 5 and 6 are sections respectively on the lines 5-5 and 6-5 of Figure 4;

Figure 7 is a perspective showing the package after another step in its formation has been effected; and

Figure 8 is a perspective showing the completed and closed package.

Referring now to the drawings, the packagestructure herein contemplated embodies two blanks, one of which is designated l0 and the may be formed of any material other: than "that mentioned, it being important merely'f'or sealing purposes, as will hereinafter-appear, that 9. marginal portion of the inner member .ll be coated with some form of cementitious material. The parawax composition above mentioned constitutes such a material in that it becomes plastic when subjected to heat and pressure, so that two surfaces, both coated with such material, will become strongly bonded together when so treated.

. As shown in Figure 1,the outer blank I0 is cut and scored so that'it may be folded along the various score lines indicated to receptacle-form, wherein the ends are composed of overlapping flaps of which the outer ones are interlocked by suitable connections suchas interfitting tongues and openings. The inner member or liner II' is formed of a sheet of material which is preferably die-cut to the generally rectangular shape illustrated in Figure 1 with a tongue-like extension at one side. The tongue-like extension marked 12 ultimately forms the top of the receptacle which is to be formed from the lining element.

In forming the package, an outer member i0 and an inner member II are associated together with the liner disposed on the inside face of the outer member in and the impervious coating such as parawax on the inside or upper surface of the liner.

Such an assembly of inner and outer members may be operated upon by a machine of the type shown in the patent to Peters No, 1,025,880, May 7, 1912,'whereby the liner and outer member In and II are simultaneously folded to U-shape, wherein the parts i3 and M of the liner and outer member respectively form the bottom of the structure, and the parts I5 and I6, respectively, and IT and I8, respectively, of the inner and outer members form the back and front walls of the receptacle. members are in the form of a trough-like structure, and a subsequent operation efiects folding other of which is designated ll, theblank l0 being preferably of relatively heavy cardboard stock and the blank ll being preferably formed coated with such material are available in the trade under the name l?aracote." For the purpose of the present invention, the lining sheet of end flaps i9 and 20 of the outer member and corresponding portions 21 and 22 of the inner memberupwardly into transversely extending position relative to the trough-like structure so as to close the ends of the same, thereby forming a rectangular receptacle.

In the operation of forming the end closures as thus far explained, substantially square corner portions 23 of the liner are folded upon themselves as indicated in Figure 2. Subsequent receptacle-forming operations of the machine serve to fold the front wall end flaps 24 and 25 inwardly, and lncidently to fold the adjacent Initially, the inner and outer also folded inwardly together with the adjacent folded corner portions 23 of the liner until the latter are in face-.to-face engagement with the outside face of the front wall end fiaps 24 and 25, respectively. Because of the folded condition of the corner portions 23 of the inner member, the tongue-shaped rear wall end flaps 26, 26 may have access to locking slots such as shown at 21, provided in the front wall end flaps 24 and 25, and the apparatus referred to may be such as to automatically tuck said tongue members into said slots. Thestructure then. is in the condition illustrated in Figure 3.

In the case of packaging material such as cheese, the material may be poured into the receptacle while in a molten or flowing state since the corners of the inner member are effectively closed incident to the sharp folding thereof as indicated. Even though the material should leak past the corner-forming folds, no harm would result since it would merely find its way between the folds of the corner portions 23 but could not in any event escape from the package since thereare no openings or joints therein below the top edges of the end' and rear walls of the receptacle as shown in Figure 3. In Figure 3 the package is illustrated as being filled with material such as cheese, the top surface of the fill being indicated at 28.

The next step in the formation of the package is to fold the top wall-forming flap l2 of the liner member inwardly over the surface 28 of the package content, this being readily accomplished by mechanical means of a size to fit properly within the confines of the upper marginal portions of the end and back walls of the inner member. Incident to such inward folding of the top wall l2, marginal portions thereof as indicated at l2a, l2b and '20 are turned upwardly to register with the said upper marginal portions of the end and back walls of the receptacle. In turning the marginal portions of the top member in this manner, small bellows folds such as indicated at 12d are formed in each of the rear comers, so that a smooth-fitting condition is obtained. The registering marginal portions l2a, I2b and He of the top member and of the end and back walls of the receptacle are next subjected to the application of sufllcient heat- 1 closure thus formed constitutes in effect a hermetically sealed container, especially so in view of the existence of an unbroken coating or sheet of the thermo-plastic material with which the inside of the wrapper is coated, this being exceptionally true where coatings such as the rubber-wax composition above referred to are employed. When such coatings are employed, the character of the sheet bearing the coating is not of such great importance since it serves essentially as a carrier for the coating and supplies mainly the means for facilitating shaping of the impervious coating into a container. However, it will be apparent that the required strength, rigidity, imperviousness, color and other appearance characteristics may be determined by the kind of sheet material selected to carry the thermo-plastic coating.

To complete the package, end flaps such as indicated at 29 and which extend upwardly from the tongued end members 26 are folded inwardly over the top of the package to the position illustrated in Figure 7. Incident to such folding of the'end flaps 29 over the top of the container, the united marginal end portions of the inner wrapper are folded inwardly over the package content, the rear flap being folded diagonally as indicated at 30-30. Thereafter, the cover 3| of the outer container is folded forwardly and downwardly over the top of the container, thereby also incidently folding the adjacent upstanding rear marginal portions of the inner container. A front fiap 32, provided on the front edge of the cover member 3|, may then be tucked into the container, between the outer container and the inner container as indicated in Figure 8.

The above described package structure is such that it may be formed into a'lined open package ready for filling by automatic packaging machinery with which many concerns are already equipped, and the closing operation may be performed by relatively simple mechanism which may be associated with the path of travel of the invention, and the described structure is intended as illustrative and the scope of the invention should be determined by reference to the following claims, the terms of which are not necessarily restricted to the specific package form and construction herein shown but rather are directed to the invention herein disclosed.

I claim:

1. In a substantially rectangular package of the class described, a wrapper of impervious sheet material comprising a main body portion, adapted to be folded to provide bottom and side wall portions, a cover-forming portion, and continuous, narrow, marginal extensions from the free edges of said cover and side wall portions, the marginal extensions from said cover portion being adapted to be folded to angular relation to said cover portion and positioned in face-to-face relation to said marginal extensions from said side wall portions, and said face-to-face portions being foldable inwardly over the cover portion tensions being adhesively united to seal the wrapper, and said united portions being foldable inwardly over the top of the package.

3. In a substantially rectangular package of the class described, a wrapper of impervious sheet material comprising a main body portion adapted vto be folded to provide bottom and side wall portions, a cover-forming portion, and continuous, narrow, marginal extensions from the free edges of said cover and side wall portions, the marginal extensions from said cover portion being adapted to be folded to angular relatio to said cover portion and positioned in face-toface relation to said marginal "extensions from said side wall portions, said face tQ-Tace marginal extensions being provided on their mutually engaging faces with coatings of thermo-plastio material and said coatings being fused so as to unite said marginal extensions and to seal the wrapper, and'said united portions being foldable inwardly over the top of the package.

4. In a substantially rectangular package of the class described, a wrapper formed from a sheet of material coated on one surface with a thin, impervious coating of thermo-plastic material, said wrapper comprising a main body tinuous, narrow, marginal extensions from the free edges of said cover and side wall portions, the marginal extensions from said cover portion being adapted to be positioned in face to face relation to said marginal extensions from said side wall portions, and said face-to-tace marginal extensions being adhesively united toseal the wrapper.

8. In a substantially rectangular package of the class described, a wrapper of impervious sheet material comprising bottom, side wall, and

cover-forming portions and corner gusset portions integral with each pair of adjacent side wall ends, and continuous, narrow, marginal extensions on the free edges of said side wall, cover, and gusset portions, the marginal extensions of said gusset portions being ioldable intooverlapping relation tomarginal extensions of certain of said side walls and the marginal extenunite said marginalportions and seal the package, and said united portions being foldable inwardly over the top of the package.

5. A package according to claim 1 wherein the package structure therein set forth constitutes an inner container and which is enclosed in sions of said cover portion being adapted to be positioned in face-to-facerelation to said side wall marginal extensions, and said face-to-face extensions being adhesively united to seal the wrapper.

FRANK D. PAIMER. 

